CPU cooling structure with a ventilation hood

ABSTRACT

A CPU cooling structure includes a ventilation hood mounted in between a heat sink and a cooling fan, the ventilation hood having a conical outer hood shell and a conical inner hood shell concentrically formed integral with a flat mounting base thereof and fitted into a conical top receiving space of the heat sink, and radial partition ribs connected between the conical outer hood shell and the conical inner hood shell and separating the space between the conical outer hood shell and the conical inner hood shell into multiple wind passages adapted to guide currents of air from the cooling fan downwards toward the center of the heat sink.

BACKGROUND OF THE INVENTION

[0001] The present invention relates to a CPU cooling structure and,more particularly, to such a CPU cooling structure, which comprises aheat sink, a cooling fan mounted on the heat sink at the top, and aventilation hood suspended from the bottom side of the cooling fan andfitted into a conical receiving space in the heat sink to guide downwardcurrents of air from the cooling fan toward the center area of the heatsink to quick dissipate heat energy from the heat sink.

[0002] Conventional heat sinks for CPU commonly have upright radiationfins disposed at the top for dissipation of heat energy transmitted fromthe CPU below. The formation of the upright radiation fins iscomplicated, resulting in high cost. When a heat sink is used, a coolingfan is matched and mounted on the upright radiation fins of the heatsink. When started, the cooling fan causes upward currents of air tocarry heat energy from the heat sink. Because cooling currents of airflow from the bottom side toward the top side, heat energy tends to beaccumulated at the center area of the CPU. Therefore, the coolingefficiency of conventional heat sinks is low.

SUMMARY OF THE INVENTION

[0003] The present invention has been accomplished to provide a CPUcooling structure, which eliminates the aforesaid drawbacks. Accordingto one aspect of the present invention, the CPU cooling structurecomprises a heat sink, a cooling fan, and a ventilation hood adapted toguide currents of air downwards from the cooling fan toward the centerof the heat sink, enabling heat energy to be quickly dissipated carriedaway from the heat sink. According to another aspect of the presentinvention, the ventilation hood comprises a flat mounting base, aconical outer hood shell and a conical inner hood shell concentricallyformed integral with a bottom surface of the flat mounting base andfitted into a conical top receiving space of the heat sink, and radialpartition ribs connected between the conical outer hood shell and theconical inner hood shell and separating the space between the conicalouter hood shell and the conical inner hood shell into multiple windpassages adapted to guide currents of air from the cooling fan downwardstoward the center of the heat sink.

BRIEF DESCRIPTION OF THE DRAWINGS

[0004]FIG. 1 is an elevational view of a ventilation hood for a CPUcooling structure according to the present invention.

[0005]FIG. 2 is a bottom plain view of the ventilation hood shown inFIG. 1.

[0006]FIG. 3 is a top plain view of the ventilation hood shown in FIG.1.

[0007]FIG. 4 is an elevational view of the CPU cooling structureaccording to the present invention.

[0008]FIG. 5 is an exploded view of the CPU cooling structure accordingto the present invention.

[0009]FIG. 6 is a sectional view showing the flowing direction ofcurrents of air according to the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT

[0010] Referring to FIGS. From 1 through 6, a CPU cooling structure inaccordance with the present invention is generally comprised of aventilation hood 1, a cooling fan 2, and a heat sink 3. The cooling fan2 is supported above the heat sink 3. The ventilation hood 1 is fittedinto the heat sink 3 and supported between the heat sink 3 and thecooling fan 2.

[0011] The heat sink 3 comprises a plurality of radially extendedupright radiation fins 31, and a plurality of top mounting holes 32. Theupright radiation fins 31 have a respective curved top edge, defining aconical receiving space at the center of the top side of the heat sink3. The ventilation hood 1 comprises a flat mounting base 11, a conicalouter hood shell 12 and a conical inner hood shell 13 concentricallyformed integral with the bottom surface of the flat mounting base 11 andfitted into the conical receiving space defined by the curved top edgeof each of the upright radiation fins 31, and radial partition ribs 14connected between the conical outer hood shell 12 and the conical innerhood shell 13 and separating the holding space between the conical outerhood shell 12 and the conical inner hood shell 13 into separated windpassages 15. The conical inner hood shell 13 has an inner diametergradually downwardly reduced from the flat mounting base 11. The radialpartition ribs 14 also reinforce the structural strength of theventilation hood 1. The flat mounting base 11 comprises a plurality ofmounting holes 111 disposed in the four corners thereof and respectivelyconnected between the respective mounting holes 21 of the cooling fan 2and the respective mounting holes 32 of the heat sink 3 by fasteningelements, for example, screws 4.

[0012] During the operation of the cooling fan 2, currents of air flowdownwards through the wind passages 15 toward the center area of theheat sink 3, and then flow out of the heat sink 3 radially through thegaps in between the upright radiation fins 31 of the heat sink 3 tocarry heat energy away from the heat sink 3 efficiently. Because theouter hood shell 12 and inner hood shell 13 have a conical shape, theventilation hood 1 effectively prevents reverse flow of air.

[0013] A prototype of CPU cooling structure has been constructed withthe features of FIGS. 1˜6. The CPU cooling structure functions smoothlyto provide all of the features discussed earlier.

[0014] Although a particular embodiment of the invention has beendescribed in detail for purposes of illustration, various modificationsand enhancements may be made without departing from the spirit and scopeof the invention. Accordingly, the invention is not to be limited exceptas by the appended claims.

What the invention claimed is:
 1. A CPU cooling structure comprising aheat sink, a cooling fan, and a ventilation hood, wherein saidventilation hood comprises a flat mounting base fixedly connectedbetween said heat sink and said cooling fan by fastening elements, aconical outer hood shell and a conical inner hood shell concentricallyformed integral with a bottom surface of said flat mounting base andinserted into said heat sink, and radial partition ribs connectedbetween said conical outer hood shell and said conical inner hood shell,and wind passages defined within said conical outer hood shell outsidesaid conical inner hood shell and separated from one another by saidpartition rids and adapted to guide currents of air downwards from saidcooling fan toward said heat sink, said conical inner hood shell havingan inner diameter gradually downwardly reduced from said flat mountingbase toward said heat sink.
 2. The CPU cooling structure of claim 1wherein said heat sink comprises a plurality of radially extendedupright radiation fins, said upright radiation fins having a respectivecurved top edge defining a conical receiving space at the center of atop side of said heat sink for receiving the conical outer hood shelland conical inner hood shell of said ventilation hood.